Roller bit



Jan. 29, 1935. G E. BEHNKE 6 ROLLER BIT Y Original Filed Dec. 1, 1932 Guy E.Behnlre INVENTOR.

ATTQRNEY.

Patented Jan. 29, 1935 Guy E. Behnke,

Oklahoma City, Okla, assignor to Reed Boiler Bit Company,

Houston, Tex,

a corporation of Texas Original application December 1, 1932, Serial No.

Divided and this application August 27, 1934, Serial No. 741,623

3 Claims. (Cl- 255-71) This invention relates generally to deep well drilling apparatus, and specifically to roller hits, the present application being a division of my application Serial Number 654,143, flled Decemher 1, 1932, which has matured into Patent Number 1,972,256, granted September 4, 1934.

The invention disclosed -by the present application has for its'object the provision of new and improved bearings for roller cutters, and

will be found particularly useful in that conventional type of roller bit including a head having a substantially V-shapedcutter recess in the bottom thereof ,"and substantially conical cutters in said recess.

A specific object of-the invention is to provide a bearing for roller cutters of the conical type including rollers to strongly support the cutters and balls between the rollers and the head to rotatably lock the cutter in place. The preferred embodiment of the invention is illustrated by the accompanying drawing, of which Fig. 1 is a partly sectional elevation, and Fig.2 a detail view at a right angle to 'Fig. 1. In the drawing the bit head is indicated at 1. It has in its lower end a substantially V-shaped recess 2 for the reception of the substantially conical roller cutter 3. Each of these cutters is mounted on the head by means which will now be described.

In the wall of the recess is a downwardly opening slot 4 for the reception of a cutter support 5, which may be removably welded therein. The

support 5 has an opening 6 to receive the cutter pin 7, which may be removably welded therein, and an annular flange 8 projecting downwardly and inwardly into the recess 2 and surrounding the pin'l. The pin '7 has an annular flange 9 bearing against the annular flange 8 of the support and forming with the flange 8 a raceway for balls 10, anda roller raceway 11 for rollers 12.

The advantagesof this contruction will be apparent to those skilled in the art.

I claim: 4 1. A roller bit having a head, said head havto said head, a pin removably secured to ing a cutter recess, a support removably secured said support, said support having an annular flange surrounding said pin, and projecting downwardly and inwardly into said recess, said pin having thereon an annular flange bearing against the annular'flange of said support and forming withsaidsupport flange a ball raceway, said .pin having a roller raceway, a cup-shaped cutter enclosq ing said pin and flange, said cutter having aball raceway and a roller raceway, balls between the raceway formed by the flanges of said support and pin and the raceway in said cutter, and rollers between the roller raceways of said pin" and cutter, said balls serving to rotatably lock 15 said cutter on said pin. 2. A roller bit having a support, a pin removably secured to said support, said support having an annular flange surrounding said pin, said pin having thereon anannular flange bearing against the annularflan'ge of said support and forming with said support flange a ball raceway, said pin having a roller raceway, a cup-shaped cutter enclosing said pin and flange, said cutter having a ball raceway and a roller raceway, halls between the raceway formed by the flanges'oi said support and pinand the raceway in said cutter, and rollers between the roller raceways of said pin and cutter, said balls serving to roso tatably lock said cutter on said pin.

3; A roller bit having a support, a'pin removably secured to said support. said support having an annular flange surrounding said pin, said, pin having thereon an annular flange forming with 35 said support flange a ball raceway, said pin having a roller raceway, a cup-shaped cutter enclos-- in'g saidpin and flange, said cutter having a ball raceway and a roller raceway, balls between the racewayiormedby the flanges of said sup- 40 port and pin and the raceway in said cutter and rollers. between the roller raceways of said pin and cutter,;said bails serving to rotatably lock said cutter on said pin.

G Y E. BEHNKE. as 

